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首页> 外文期刊>Meat Science >Effects of vitamin A supplementation on growth performance, carcass characteristics and meat quality in Limosin x Luxi crossbreed steers fed a wheat straw-based diet
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Effects of vitamin A supplementation on growth performance, carcass characteristics and meat quality in Limosin x Luxi crossbreed steers fed a wheat straw-based diet

机译：饲喂麦草的日粮中补充维生素A对利木赞x鲁西杂交种公牛生长性能，car体特性和肉品质的影响

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摘要

Three experiments were conducted to examine the effects of dietary vitamin A supplementation on performance and carcass parameters in Limosin × Luxi crossbreed finishing steers fed a wheat straw-based diet. Sixteen 12-month old (301 ± 22 kg) steers, 16 12-month old (309 ± 15 kg) steers and 16 24-month old (411 ± 20 kg) steers were used in experiment 1 for 6 months feeding period, in experiment 2 for three months feeding period and in experiment 3 for three months feeding period, respectively. Sixteen steers of each experiment were randomly divided into the four groups of four animals. Treatments consisted of four vitamin A supplementation levels (0, 1100, 2200 and 4400IU/kg DM). The growth rate was affected by dietary vitamin A level in experiment 1 and 2, revealing that the suitable amount of vitamin A supplementation increased the growth rate; excessive vitamin A in the ration decreased the growth rate of 12-month-old finishing steers. The marbling deposition decreased with the increment of vitamin A supplementation level, but possibly associated with vitamin A supplementing duration. Furthermore, the suitable dietary vitamin A level probably decreased lipid and pigment oxidation, and increased the tenderness of beef meat. Vitamin A supplementation had no significant effect on chemical composition of gluteus med-ius muscle and longissimus dorsi muscle.
机译：进行了三个实验，以研究膳食维生素A补充对饲喂小麦秸秆日粮的Limosin×Luxi杂种育肥牛的性能和car体参数的影响。在实验1中使用16头12个月大（301±22公斤）的公牛，16头12个月大（309±15公斤）的公牛和16头24个月大的（411±20公斤）的公牛，饲养6个月。实验2的三个月的喂食期和实验3的三个月的喂食期。每个实验16头ers牛随机分为四组，每组四只动物。治疗包括四种维生素A补充水平（0、1100、2200和4400IU / kg DM）。在实验1和2中，生长速度受饮食中维生素A水平的影响，表明适量的维生素A补充可提高生长速度；日粮中过量的维生素A降低了12个月大肥育公牛的生长速度。大理石花纹的沉积物随维生素A补充水平的增加而减少，但可能与维生素A补充的持续时间有关。此外，适当的饮食维生素A水平可能会降低脂质和色素的氧化，并增加牛肉的嫩度。补充维生素A对臀中肌和背最长肌的化学成分没有明显影响。

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